Re: [PATCH] Direct I/O bio size regression

[Lee Revell <rlrevell@joe-job.com>]

On Wed, 2006-04-26 at 12:30 +1000, David Chinner wrote:
> Got any data that you can share with us?
> 

The thread was from July 2004 and was called:



Re: [linux-audio-dev] Re: [announce]
[patch] Voluntary Kernel Preemption
Patch

Also some info in thread:



Re: [patch]
voluntary-preempt-2.6.8-rc2-M5

> Wrt latency, is the problem to do with large requests causing short
> term latency? I thought that latency minimisation is the job of the
> I/O scheduler, so if this is the case, doesn't this indicate a
> deficiency of the I/O scheduler? e.g. the I/o scheduler could split
> large requests to reduce latency, just like you merge adjacent
> requests to reduce the number of I/Os and keep overall latency
> low...
> 

I think you are talking past each other - Jens is referring to scheduler
latency, not IO latency.

Lee